| 摘要 |
<p>A polyurethane lacquer contains a polyurethane which has been obtained by reacting an organic polyisocyanate with dimerized and/or trimerized fatty alcohols which contain 36 or 54 carbon atoms in the molecule and an inert organic solvent. The fatty alcohols may be partly replaced by their alkylene oxide addition products provided not more than 12 mol of alkylene oxide per mol of fatty alcohol are added on. Aromatic and aliphatic di- and tri-isocyanates are listed. The two components are dissolved in an inert solvent, e.g. ethyl acetate, toluene, lunzene, xylene, methylene chloride, ethylene glycol diacetate or dioxan. In an Example (1) a dimeric fatty alcohol obtained by dimerization of unsaturated C18 fatty acids followed by reduction was dissolved in a mixture of ethyl acetate, butyl acetate, ethylene glycol diacetate and toluene and mixed with an adduct of tolylene diisocyanate and trimethylol propane (molar ratio 3 : 1).ALSO:A polyurethane lacquer which contains a polyurethane which has been obtained by reacting an organic polyisocyanate with dimerized and/or trimerized fatty alcohols which contain 36 or 54C in the molecule, and an inert organic solvent may be used to coat by spraying, brushing or dipping substrates e.g. steel, iron, copper, aluminium, sheets, beechwood boards, plastics, textiles, paper, or flexible rubber pieces. In a typical Example (3) a lacquer containing the reaction product of a dimeric fatty alcohol and a prepolymer of tolylene diisocyanate and trimethylol propane in a mixture of butyl acetate, ethylene glycol diacetate and toluene was brushed on to beechwood boards.</p> |
